Researchers developed a 263-GHz electron paramagnetic resonance system using a 10-W traveling-wave tube amplifier to deliver high-power pulses across a 5.6-GHz bandwidth.
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The system operates without a resonant cavity and can examine samples of approximately 12 μL, compared with about 30 nL in a commercial 263-GHz cavity-based system.
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For trace manganese(II) in magnesium oxide, the 263-GHz system achieved a signal-to-noise ratio of approximately 1,540, 12.5 times the ratio measured with a commercial X-band system.
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The researchers measured manganese in frozen water, bound to EDTA, and incorporated into calprotectin and PsaA, revealing differences in the metal’s coordination environment.
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The system could support research on metalloproteins, catalysts, molecular magnets, electron-nuclear spin interactions, and electron-polarization methods for improving nuclear magnetic resonance sensi
